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Ch 10
Liquids and Solids key terms
| AP Chem term (Ch. 10) | Definition |
|---|---|
| condensed states | liquids and solids. |
| intermolecular forces | relatively weak interactions that occur between molecules. |
| dipole-dipole attraction | the attractive force resulting when polar molecules line up so that the positive and negative ends are close to each other. |
| hydrogen bonding | unusually strong dipole-dipole attractions that occur among molecules in which hydrogen is bonded to a highly electronegative atom (N, O, F). |
| London dispersion forces | the forces, existing among noble gas atoms and nonpolar molecules, that involve an accidental dipole that induces a momentary dipole in the neighbor. |
| surface tension | the resistance of a liquid to increase in its surface area. |
| capillary action | the spontaneous rising of a liquid in a narrow tube. |
| viscosity | the resistance of a liquid to flow. |
| crystalline solid | a solid with a regular arrangement of its components. |
| amorphous solid | a solid with considerable disorder in its structure. |
| lattice | a three-dimensional system of points designating the positions of the centers of the components of a solid (atoms, ions, or molecules). |
| unit cell | the smallest repeating unit of a lattice. |
| X-ray diffraction | a technique for establishing the structure of crystalline solids by directing X rays of a single wavelength at a crystal and obtaining a diffraction pattern from which inter-atomic spaces can be determined. |
| ionic solid (salt) | a solid containing cations and anions that dissolves in water to give a solution containing the separated ions which are mobile and thus free to conduct electrical current. |
| molecular solid | a solid composed of neutral molecules at the lattice points. |
| atomic solid | a solid that contains atoms at the lattice points. |